How to make radiobuttons and JList do the same thing??

Hi! I'm trying to take the text and change it to Bold, Plain, or Italic. I can do this with radio buttons, but I am having trouble trying to make the same thing happen when trying it on the same JFrame with a JList selection. Also, I'm trying to make the changed text display onto a label which I am also having trouble...can anyone help? Here is my code: